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HathiTrust is the gold standard for academic scans. Search their digital library. If the 1975 Sugar and Spice was a textbook or a state-issued curriculum guide, a university library may have scanned it. You may need to log in via a partner institution, but many full-text PDFs are available to the public after a free account creation.
If you are searching for a specific document, verify which of these legacies you are tracking: Historical Archives:
Crucially, a 1975 pamphlet often contains instructions on with sugar as a preservative—techniques that the USDA has since updated for safety. Do not follow 1975 canning advice verbatim; modern PDF hunters often seek these for historical comparison, not active use.